package com.changgou.system.filter;

import com.changgou.system.util.JwtUtil;
import org.apache.commons.lang.StringUtils;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

@Component
public class AuthorizeFilter implements GlobalFilter, Ordered {

	@Override
	public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
		//获取请求对象
		ServerHttpRequest request = exchange.getRequest();
		//获取响应对象
		ServerHttpResponse response = exchange.getResponse();
		//判断当前的请求是否为登录请求,如果是,则放行
		if (request.getURI().getPath().contains("/admin/login")) {
			return chain.filter(exchange);
		}
		//获取请求头信息
		HttpHeaders headers = request.getHeaders();
		//获取jwt信息
		String jwtToken = headers.getFirst("token");
		//判断当前令牌是否存在
		if(StringUtils.isEmpty(jwtToken)){
			//不存在,客户端返回错误提示信息
			response.setStatusCode(HttpStatus.UNAUTHORIZED);
			return response.setComplete();
		}
		//如果存在,解析令牌,如果令牌不合法，返回错误信息
		try {
			JwtUtil.parseJWT(jwtToken);
		}catch (Exception e){
			e.printStackTrace();
			response.setStatusCode(HttpStatus.UNAUTHORIZED);
			return response.setComplete();
		}
		// 放行
		return chain.filter(exchange);
	}

	@Override
	public int getOrder() {
		return 0;
	}
}
